Trouble in paradise? Vishnu/FFtec N54 335ii Single Turbo kits experiencing issues as a BimmerBoost member runs 12.5@121 with misfires and having to short shift

BimmerBoost would like to thank member GeorgiaTech335Coupe for his openness and honesty regarding his Vishnu/FFTEC single turbo setup. Recently, this member took his single turbo upgraded 6-speed manual 335i to the PBIR (Palm Beach International Raceway) dragstrip in Florida to do some testing. His best run was a 12.50@121.6 alongside a 12.8@117. Yes, these times are quite a ways away from the 10.8@131 glory pass from Vishnu demonstrating the kits capability.

This is in no way the fault of GeorgiaTech335Coupe who experienced misfires on his car and had to short shift at 6300 rpm in order to avoid them. Now, Vishnu has basically portrayed this kit as perfect and ready for sale with nobody having any issues. The reason BimmerBoost is bringing this issue to the attention of the community is for potential buyers to understand what they are getting into.

There is absolutely nothing wrong with having issues when modifying a car to this level and BimmerBoost is confident Vishnu will resolve them. There is something wrong with pretending nothing is wrong. A few cars with the single turbo kits have gone up for sale and apparently a total of three people, that are willing to open their mouths, are having misfire issues with these kits.

These issues will no doubt get resolved but potential buyers and current customers needs to be aware of the process, effort, and that progress is being made. Pretending nothing is wrong and collecting money simply is the wrong way to go about this and once again (it's becoming a trend) BimmerBoost is the only site bringing these issues to the attention of the community.

For the record, a member by the name of @tmo335tt says he has a hardware solution for the misfires that he will likely share with Vishnu (hopefully not for free). Interesting that it isn't Vishnu but the community solving this.

Thanks again to @GeorgiaTech335Coupe for sharing his details, good or bad, as we all learn thanks to honesty and openness. There is more to tuning than just collecting money.

138mph@7200rpm on a 6MT transmission 335i with 3.46 gears and a 26.5" tire in 4th gear
135mph@7200rpm on a 6MT transmission 335i with 3.46 gears and a 26.0" tire in 4th gear

EDIT: In fact, with a 3.46 on a 6MT you don't need larger than a 25" tire to hit 130mph in 4th:

130mph@7200rpm on a 6MT transmission 335i with 3.46 gears and a 25.0" tire in 4th gear

For a more concrete example, on Hoosier DRs (DOT approved lol) 275/40/17 which fits all 335s out there that I know and on some nice lightweight rims such as Apex ARC-8 17x9 or Kosei K1s, it'd be a perfect combo:

So one of you are realistically going to go faster than 135mph right? 3.46 sounds like the perfect gearing for 1/4 mile and 60-130.

Unfortunately at the 1/4 the 3.46 will be a pain unless running slicks...way too much gear for a 6MT, even 3.08 is too much to launch...60-130 though with a 3.46 I could go probably about 0.4-0.5 faster

EDIT: Discussing with @DefactoM6, great point he brought up actually. The faster the car's acceleration the taller the tire will be required to reach the same speeds at a given RPM. In other words, the above calcs are just that, calculations/approximations, but from what I've seen on my car and changing gear ratios its pretty close..not exact numbers for sure

I feel very fortunate that I can use the Audi R8 coils on my engine, at a whopping $16 a piece.

OEM coil is $48 from Tischer...not a big deal guys

I think more people should jump the bandwagon to the NGK 5992 plugs with a shorter gap to give them a bit more life and give the overall ignition system a bit of a break at higher power levels...the stock gap at high boost/ignition levels the car is exposed to with meth/E85/race gas is probably putting the ignition system into overdrive making the coils go much sooner than they would otherwise..

I think more people should jump the bandwagon to the NGK 5992 plugs with a shorter gap to give them a bit more life and give the overall ignition system a bit of a break at higher power levels...the stock gap at high boost/ignition levels the car is exposed to with meth/E85/race gas is probably putting the ignition system into overdrive making the coils go much sooner than they would otherwise..

DZENNO Can you possible provide a little more data on the plugs? I will be changing my plugs soon, and while not at a high HP rating, would like to know if there would be a benefit for those of use with minor mods as well. I plan on picking up a Cobb AP here in the next month with an FMIC and getting PFT tuned. Thank you!

After break-in pure stock with run flats I had real bad wheel hop the first time I ever launched in 1st from a standing start. I have never driven a performance car including IRS versions this sensitive to wheel hop right out of the box.